sims 4 wont launch after update and installing expansion pack

@lushifii  As a test, please try playing in a clean user folder.  Move the entire Sims 4 folder out of Documents > Electronic Arts and onto your desktop, and when you launch the game, if it launches, a clean folder will spawn with no content.  (Your saves and other content will be intact in the folder you moved but temporarily not read by the game.)  Don't add anything to the new folder yet; just let me know whether you can get far enough to start a new save and play in live mode for a bit.

If that doesn't help, please run a dxdiag and attach it to a post.

https://help.ea.com/en/help/pc/how-to-gather-dxdiag-information/

I won’t lose anything correct? But what do I do with the other folder  I put onto my desktop? What about all my previous things?

@lushifii  Moving the folder won't delete any data.  Even though you can't see it in-game, it's still intact and will be available for you to use once you've moved it to the new Sims 4 folder.  But please don't do that until you've tested the game.  If Sims 4 still doesn't work, then we need to address that issue before restoring your previous data.  Just leave the folder on your desktop for now.

Ok so when I moved the folder, a thing popped up saying “folder in use. the action can’t be completed because the folder or file in it is open in another program.. close the folder or file and try again”.

What should I do to proceed from here? Should I select try again, skip, cancel, do I check the box?

@lushifii  This is typically a OneDrive error: OneDrive is in the process of syncing the folder and won't let you move it until it's finished.

First, before you do anything else, make a backup of the entire Sims 4 folder.  Right-click it and select Copy, then right-click and paste where you're storing the backup.  Ideally, you'd use an external drive or USB stick, but if you don't have one handy, put the copy in Downloads.

Next, pause OneDrive syncing and cancel the current sync:

https://support.microsoft.com/en-us/office/how-to-cancel-or-stop-sync-in-onedrive-4885c27e-3d89-4d69-be75-2646c71367d3

It's best to then stop OneDrive from syncing Documents entirely:

https://support.microsoft.com/en-us/office/choose-which-onedrive-folders-to-sync-to-your-computer-98b8b011-8b94-419b-aa95-a14ff2415e85

This will likely remove the local (on your computer) copy of the Sims 4 folder as well as anything else in Documents.  You can still download the files from OneDrive, either through the app on your computer or through the website.  But you also have the backup of the Sims 4 folder, so you don't have to worry about that at least.

Finally, go ahead and test the game as discussed earlier.

Can I paste the backup folder onto my desktop? Also, when I stop OneDrive from syncing my documents, all my previous gameplay and saves will still remain in the backup folder, correct?

Oh, and I also wanted to mentioned I had talked to an EA support on 11/22/22, the day I got the expansion pack and successfully installed it. That was when my issue started of my game being unable to launch. The EA support told me it was because the new expansion pack was still processing, and that the payment hadn’t been approved yet. The next day, I checked and it said completed on my EA account, but the payment hadn’t processed through my bank account yet. So could this be a possible reason? 

ok, so i did the onedrive thing and the game launched! however, it was a completely new game since I moved my previous folder into my downloads. where do i go from here? what do i do with the backup folder of my sims that has everything? 

@lushifii  The game is supposed to be new, as in, devoid of any user-created content, when you move the Sims 4 user folder.  The point is to test with none of that content present.  If the game runs properly, the problem is something in that old user folder, as is true in your case; if it still didn't work, you'd know the problem lay elsewhere.

You can start moving the content from your old Sims 4 folder to the new one.  If you have any mods or custom content, test those first, and if you run into problems, use the 50/50 method to sort through the files.

https://modthesims.info/wiki.php?title=Game_Help:Finding_Problem_Custom_Content#The_50.25_Method

Once you've done that, or start here if you don't use mods or cc, move over the contents of Tray, not the Tray folder itself but just the files inside, and test again.  Then move anything else you'd like to keep; here's a description of everything in your user folder:

https://sims4.crinrict.com/eng/2014/09/user-files-explained/

Where the game has generated a new copy of a file, it's best to leave that in place rather than restoring your old one.

Leave your saves for last, after you've tested everything else.  Here again, move the files themselves, not the folder they're in.

For the missing pack, please contact customer support again and explain that you don't see the content in your library even after this many hours.  But no, this shouldn't have prevented Sims 4 from launching at all.

Will my previous households (with cc) still be present when I start moving over my custom content to the new folder from my old folder? Also, may I ask what you mean when “move the files themselves”? Which files are you referring to? Which ones do I move?